<!DOCTYPE html> <meta charset="utf-8"> <title>CSS Test: details children blockification</title> <link rel="author" href="mailto:masonf@chromium.org"> <link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements"> <meta name="assert" content="Ensure blockification of <details> children"> <script src=/resources/testharness.js></script> <script src=/resources/testharnessreport.js></script> <div id="example1"> <details style="display: grid" open> <summary style="display: inline">foo</summary> <div style="display: inline">bar</span> </details> </div> <div id="example2" style="display: grid"> <details style="display: contents" open> <summary style="display: inline">foo</summary> <div style="display: inline">bar</span> </details> </div> <script> function checkDetails(details) { assert_equals(getComputedStyle(details.querySelector('summary')).display, "block"); assert_equals(getComputedStyle(details.querySelector('div')).display, "block"); } test(() => { checkDetails(document.querySelector('#example1')); checkDetails(document.querySelector('#example2')); assert_equals(getComputedStyle(document.querySelector('#example2>details')).display, "contents"); }, "Summary and content should have display:block computed value"); </script>